function hide_loader() {            
    document.getElementById("loader_container").style.display = "none";  
    document.getElementById("loader_container").style.visibility = "hidden";
}
function show_loader(tag){
    document.getElementById("loader_container").style.display = "table";  
    document.getElementById("loader_container").style.visibility = "visible";
    document.getElementById(tag).innerHTML='';
}